the area of a circle with centre O is 308cm square what is the perimeter of shaded semicircle
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let radius of circle = r
Area of circle , πr2 = 308 cm sq
r2 = 308 × 7/22
= 14 ×7
r = 7√2
perimeter of semi circle = 2r + πr2/2
= 14√2 + 154 cm sq.
=14( √2 + 11) cm sq
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